在處理UITableView表格時，我們希望在View底部添加按鈕。

用戶拖動UITableView時按鈕能跟隨移動。

如題，實現如下界面：

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    if (section >= kSetSetting) {
        return 80;
    }
    else{
        return 2;
    }
}

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    if (section >= kSetSetting)
    {
        UIView *footerView = [[UIView alloc] init];
        footerView.userInteractionEnabled = YES;
        footerView.backgroundColor = [UIColor clearColor];
        
        UIButton *loginButton = [UIButton buttonWithType:UIButtonTypeSystem];
        [loginButton.layer setMasksToBounds:YES];
        [loginButton.layer setCornerRadius:5.0];
        [loginButton setBackgroundColor:[UIColor brownColor]];
        [loginButton setTitle:@登陸 forState:UIControlStateNormal];
        [loginButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [loginButton.titleLabel setFont:[UIFont systemFontOfSize:15]];
        [loginButton setTranslatesAutoresizingMaskIntoConstraints:NO];
        [loginButton addTarget:self action:@selector(loginBtnClick:) forControlEvents:UIControlEventTouchUpInside];
        //[footerView addSubview:btnExit];
        
        [footerView addSubview:loginButton];
        
        UIButton *registerButton = [UIButton buttonWithType:UIButtonTypeSystem];
        [registerButton.layer setMasksToBounds:YES];
        [registerButton.layer setCornerRadius:5.0];
        [registerButton setBackgroundColor:[UIColor brownColor]];
        [registerButton setTitle:@注冊 forState:UIControlStateNormal];
        [registerButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [registerButton.titleLabel setFont:[UIFont systemFontOfSize:15]];
        [registerButton setTranslatesAutoresizingMaskIntoConstraints:NO];
        [registerButton addTarget:self action:@selector(registerBtnClick:) forControlEvents:UIControlEventTouchUpInside];
        [footerView addSubview:registerButton];
        
        NSDictionary *constraintsView = NSDictionaryOfVariableBindings(loginButton,registerButton);
        
        [footerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@V:|-15-[loginButton]-15-|  options:0 metrics:nil views:constraintsView ]];
        [footerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@|-20-[loginButton]    options:0 metrics:nil views:constraintsView ]];
        
        [footerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@V:|-15-[registerButton(==loginButton)]-15-|  options:0 metrics:nil views:constraintsView ]];
        [footerView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@H:[loginButton]-30-[registerButton(==loginButton)]-20-|    options:0 metrics:nil views:constraintsView]];
        
        return footerView;
    }
    else
    {
        return nil;
    }
}

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